• Bernard R Bendok, Karl R Abi-Aad, Jennifer D Ward, Jason F Kniss, Mary J Kwasny, Rudy J Rahme, Salah G Aoun, Tarek Y El Ahmadieh, Najib E El Tecle, Samer G Zammar, AounRami James NRJNDepartment of General Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio., Devi P Patra, Sameer A Ansari, Jean Raymond, Henry H Woo, David Fiorella, Guilherme Dabus, Genevieve Milot, Josser E Delgado Almandoz, John A Scott, Andrew J DeNardo, Shervin R Dashti, and HEAT Study Investigators.
• Department of Neurological Surgery, Mayo Clinic, Phoenix, Arizona.
• Neurosurgery. 2020 May 1; 86 (5): 615624615-624.

BackgroundAneurysm recurrence after coiling has been associated with aneurysm growth, (re)hemorrhage, and a greater need for follow-up. The second-generation HydroCoil Embolic System (HES; MicroVention, Inc) consists of a platinum core with integrated hydrogel and was developed to reduce recurrence through enhancing packing density and healing within the aneurysm.ObjectiveTo compare recurrence between the second-generation HES and bare platinum coil (BPC) in the new-generation Hydrogel Endovascular Aneurysm Treatment Trial (HEAT).MethodsHEAT is a randomized, controlled trial that enrolled subjects with ruptured or unruptured 3- to 14-mm intracranial aneurysms amenable to coiling. The primary endpoint was aneurysm recurrence using the Raymond-Roy scale. Secondary endpoints included minor and major recurrence, packing density, adverse events related to the procedure and/or device, mortality, initial complete occlusion, aneurysm retreatment, hemorrhage from target aneurysm during follow-up, aneurysm occlusion stability, and clinical outcome at final follow-up.ResultsA total of 600 patients were randomized (HES, n = 297 and BPC, n = 303), including 28% with ruptured aneurysms. Recurrence occurred in 11 (4.4%) subjects in the HES arm and 44 (15.4%) subjects in the BPC arm (P = .002). While the initial occlusion rate was higher with BPC, the packing density and both major and minor recurrence rates were in favor of HES. Secondary endpoints including adverse events, retreatment, hemorrhage, mortality, and clinical outcome did not differ between arms.ConclusionCoiling of small-to-medium aneurysms with second-generation HES resulted in less recurrence when compared to BPC, without increased harm. These data further support the use of the second-generation HES for the embolization of intracranial aneurysms.© Congress of Neurological Surgeons 2020.

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